XPathNavigator.SetTypedValue Method (System.Xml.XPath)

SetTypedValue Method

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library

XPathNavigator..::.SetTypedValue Method

Sets the typed value of the current node.

Namespace: System.Xml.XPath
Assembly: System.Xml (in System.Xml.dll)

Syntax

Visual Basic (Declaration)

Public Overridable Sub SetTypedValue ( _
    typedValue As Object _
)

Visual Basic (Usage)

Dim instance As XPathNavigator
Dim typedValue As Object

instance.SetTypedValue(typedValue)

public virtual void SetTypedValue(
    Object typedValue
)

Visual C++

public:
virtual void SetTypedValue(
    Object^ typedValue
)

JScript

public function SetTypedValue(
    typedValue : Object
)

Parameters

typedValue: Type: System..::.Object
The new typed value of the node.

Exceptions

Exception	Condition
ArgumentException	The XPathNavigator does not support the type of the object specified.
ArgumentNullException	The value specified cannot be nullNothingnullptra null reference (Nothing in Visual Basic).
InvalidOperationException	The XPathNavigator is not positioned on an element or attribute node.
NotSupportedException	The XPathNavigator does not support editing.

Remarks

When an XmlDocument object is created as the result of a schema validating XmlReader object, the value specified to the SetTypedValue method is verified against the XML Schema Definition Language (XSD) schema for the XML document. If the value specified is invalid according to the schema for the XML document, an XmlSchemaException is thrown.

The SetTypedValue method is valid only when the XPathNavigator is positioned on an element or attribute node.

Examples

In the following example, the SetTypedValue method is used to update all price elements in the contosoBooks.xml file using the XmlNamespaceManager object to resolve namespace prefixes in the XPath expression.

Visual Basic

Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd")
settings.ValidationType = ValidationType.Schema

Dim reader As XmlReader = XmlReader.Create("contosoBooks.xml", settings)
Dim document As XmlDocument = New XmlDocument()
document.Load(reader)

Dim navigator As XPathNavigator = document.CreateNavigator()

navigator.MoveToChild("bookstore", "http://www.contoso.com/books")
navigator.MoveToChild("book", "http://www.contoso.com/books")
navigator.MoveToChild("price", "http://www.contoso.com/books")

Dim price As New Decimal(19.99)
navigator.SetTypedValue(price)

navigator.MoveToParent()
Console.WriteLine(navigator.OuterXml)

XmlReaderSettings settings = new XmlReaderSettings();
settings.Schemas.Add("http://www.contoso.com/books", "contosoBooks.xsd");
settings.ValidationType = ValidationType.Schema;

XmlReader reader = XmlReader.Create("contosoBooks.xml", settings);
XmlDocument document = new XmlDocument();
document.Load(reader);

XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");
navigator.MoveToChild("price", "http://www.contoso.com/books");

Decimal price = 19.99M;
navigator.SetTypedValue(price);

navigator.MoveToParent();
Console.WriteLine(navigator.OuterXml);

Visual C++

        XmlReaderSettings^ settings = gcnew XmlReaderSettings();
        settings->Schemas->Add("http://www.contoso.com/books", "contosoBooks.xsd");
        settings->ValidationType = ValidationType::Schema;

        XmlReader^ reader = XmlReader::Create("contosoBooks.xml", settings);
        XmlDocument^ document = gcnew XmlDocument();
        document->Load(reader);

        XPathNavigator^ navigator = document->CreateNavigator();

        navigator->MoveToChild("bookstore", "http://www.contoso.com/books");
        navigator->MoveToChild("book", "http://www.contoso.com/books");
        navigator->MoveToChild("price", "http://www.contoso.com/books");

        Decimal^ price = gcnew Decimal(19.99);
        navigator->SetTypedValue(price);

        navigator->MoveToParent();
        Console::WriteLine(navigator->OuterXml);

The example takes the contosoBooks.xml file as an input.

<bookstore xmlns="http://www.contoso.com/books">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
        <author>
            <first-name>Benjamin</first-name>
            <last-name>Franklin</last-name>
        </author>
        <price>8.99</price>
    </book>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
        <author>
            <first-name>Herman</first-name>
            <last-name>Melville</last-name>
        </author>
        <price>11.99</price>
    </book>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>
        <author>
            <name>Plato</name>
        </author>
        <price>9.99</price>
    </book>
</bookstore>

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0

Reference

XPathNavigator Class

XPathNavigator Members

System.Xml.XPath Namespace